[IDE] Clean up and simplify syntaxStructureKindFromNominalTypeDecl().
[IDE] Clean up and simplify syntaxStructureKindFromNominalTypeDecl().

Swift SVN r9883

codestergit/swift,hughbe/swift,hughbe/swift,adrfer/swift,lorentey/swift,hooman/swift,rudkx/swift,uasys/swift,stephentyrone/swift,JGiola/swift,swiftix/swift,kstaring/swift,KrishMunot/swift,nathawes/swift,apple/swift,khizkhiz/swift,calebd/swift,kperryua/swift,aschwaighofer/swift,JGiola/swift,brentdax/swift,gribozavr/swift,aschwaighofer/swift,tinysun212/swift-windows,jopamer/swift,cbrentharris/swift,milseman/swift,johnno1962d/swift,johnno1962d/swift,gottesmm/swift,adrfer/swift,alblue/swift,slavapestov/swift,tardieu/swift,parkera/swift,ken0nek/swift,ben-ng/swift,nathawes/swift,felix91gr/swift,Ivacker/swift,mightydeveloper/swift,atrick/swift,benlangmuir/swift,zisko/swift,emilstahl/swift,ben-ng/swift,kusl/swift,gregomni/swift,swiftix/swift,tkremenek/swift,return/swift,atrick/swift,kperryua/swift,LeoShimonaka/swift,milseman/swift,JaSpa/swift,alblue/swift,manavgabhawala/swift,JaSpa/swift,tjw/swift,stephentyrone/swift,adrfer/swift,kstaring/swift,gribozavr/swift,alblue/swift,dduan/swift,devincoughlin/swift,jckarter/swift,jmgc/swift,apple/swift,uasys/swift,xwu/swift,jmgc/swift,kusl/swift,tkremenek/swift,danielmartin/swift,IngmarStein/swift,codestergit/swift,LeoShimonaka/swift,JaSpa/swift,jckarter/swift,return/swift,gottesmm/swift,bitjammer/swift,lorentey/swift,swiftix/swift.old,shahmishal/swift,sdulal/swift,tardieu/swift,swiftix/swift.old,CodaFi/swift,Ivacker/swift,arvedviehweger/swift,karwa/swift,huonw/swift,benlangmuir/swift,shahmishal/swift,jopamer/swift,tjw/swift,calebd/swift,aschwaighofer/swift,MukeshKumarS/Swift,uasys/swift,mightydeveloper/swift,sdulal/swift,KrishMunot/swift,manavgabhawala/swift,swiftix/swift.old,ben-ng/swift,MukeshKumarS/Swift,xedin/swift,jmgc/swift,jopamer/swift,LeoShimonaka/swift,shajrawi/swift,gribozavr/swift,apple/swift,JaSpa/swift,calebd/swift,sschiau/swift,emilstahl/swift,gregomni/swift,bitjammer/swift,karwa/swift,nathawes/swift,parkera/swift,frootloops/swift,parkera/swift,amraboelela/swift,xwu/swift,swiftix/swift,devincoughlin/swift,austinzheng/swift,frootloops/swift,KrishMunot/swift,codestergit/swift,lorentey/swift,karwa/swift,shajrawi/swift,xedin/swift,shajrawi/swift,cbrentharris/swift,jmgc/swift,khizkhiz/swift,russbishop/swift,sdulal/swift,gribozavr/swift,IngmarStein/swift,natecook1000/swift,shahmishal/swift,jtbandes/swift,JaSpa/swift,mightydeveloper/swift,huonw/swift,xwu/swift,kusl/swift,glessard/swift,benlangmuir/swift,dduan/swift,return/swift,gmilos/swift,jopamer/swift,austinzheng/swift,hooman/swift,Jnosh/swift,russbishop/swift,arvedviehweger/swift,LeoShimonaka/swift,djwbrown/swift,stephentyrone/swift,allevato/swift,practicalswift/swift,Ivacker/swift,lorentey/swift,rudkx/swift,devincoughlin/swift,huonw/swift,aschwaighofer/swift,modocache/swift,JaSpa/swift,gribozavr/swift,xedin/swift,LeoShimonaka/swift,practicalswift/swift,xedin/swift,tinysun212/swift-windows,karwa/swift,karwa/swift,frootloops/swift,LeoShimonaka/swift,gregomni/swift,felix91gr/swift,devincoughlin/swift,tjw/swift,hooman/swift,jopamer/swift,shajrawi/swift,kperryua/swift,Jnosh/swift,allevato/swift,swiftix/swift,sschiau/swift,ken0nek/swift,djwbrown/swift,johnno1962d/swift,frootloops/swift,ken0nek/swift,sschiau/swift,aschwaighofer/swift,jtbandes/swift,gregomni/swift,return/swift,gribozavr/swift,aschwaighofer/swift,karwa/swift,johnno1962d/swift,alblue/swift,modocache/swift,roambotics/swift,natecook1000/swift,modocache/swift,huonw/swift,harlanhaskins/swift,hughbe/swift,codestergit/swift,airspeedswift/swift,ahoppen/swift,milseman/swift,brentdax/swift,kperryua/swift,xedin/swift,tkremenek/swift,kperryua/swift,devincoughlin/swift,dreamsxin/swift,hooman/swift,kentya6/swift,harlanhaskins/swift,sschiau/swift,Jnosh/swift,SwiftAndroid/swift,russbishop/swift,jckarter/swift,ahoppen/swift,manavgabhawala/swift,devincoughlin/swift,airspeedswift/swift,IngmarStein/swift,amraboelela/swift,gottesmm/swift,tinysun212/swift-windows,khizkhiz/swift,gmilos/swift,ken0nek/swift,roambotics/swift,jtbandes/swift,parkera/swift,swiftix/swift.old,practicalswift/swift,arvedviehweger/swift,benlangmuir/swift,frootloops/swift,karwa/swift,hooman/swift,ken0nek/swift,parkera/swift,slavapestov/swift,arvedviehweger/swift,benlangmuir/swift,cbrentharris/swift,swiftix/swift,apple/swift,Ivacker/swift,IngmarStein/swift,zisko/swift,glessard/swift,khizkhiz/swift,glessard/swift,mightydeveloper/swift,xedin/swift,johnno1962d/swift,therealbnut/swift,roambotics/swift,uasys/swift,modocache/swift,CodaFi/swift,swiftix/swift,tinysun212/swift-windows,kentya6/swift,gottesmm/swift,allevato/swift,kperryua/swift,danielmartin/swift,JGiola/swift,OscarSwanros/swift,practicalswift/swift,CodaFi/swift,cbrentharris/swift,arvedviehweger/swift,tkremenek/swift,Jnosh/swift,allevato/swift,tardieu/swift,djwbrown/swift,sdulal/swift,djwbrown/swift,austinzheng/swift,austinzheng/swift,deyton/swift,tkremenek/swift,slavapestov/swift,kstaring/swift,bitjammer/swift,modocache/swift,allevato/swift,adrfer/swift,natecook1000/swift,swiftix/swift.old,austinzheng/swift,felix91gr/swift,djwbrown/swift,brentdax/swi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